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And then there is the case of Dr. Deborah Green, a Kansas city onocologist, wife, and mother who distilled ricin from castor beans and used it to poison her husband. The case is recounted in the Ann Rule book Bitter Harvest -- it's a troubling story, mostly because it shows how normal-seeming people can do horrible things. But also because it demonstrates how easy it is to formulate ricin (Green got the idea from an Agatha Christie story).
Green's biggest problem was getting the castor beans, which she had to say were for her son's science project. But castor beans are readily available in many gardens.

He lived despite the poisoning (thank God) but it showed an interesting clinical observation:

Despite being poisoned by ricin over a long period of time he did survive.The doctors treating this man (who is also a Physician himself) did not suspect ricin until several weeks into his illness.The Doctor (victim) discovered castor beans in his wife's personal items and alerted the proper officials.

So he endured ricin poisoning over a period of several weeks and still survived proving that in certain cases it is possible to survive ricin poisoning.